Siemens PANEL PC 877 Benutzerhandbuch
Detailed descriptions
17.5 System resources
SIMATIC Panel PC 877
17-32
Operating instructions, Release 07/2006, A5E00877780-01
17.5.2
System resources used by the BIOS/DOS
The following table describes the system resources for the factory state of the device.
17.5.2.1 I/O address allocation
I/O address (hex)
Size
(bytes)
Description of the basic function
Possible alternative
function
from
to
0000
000F
16
DMA controller
0010
001F
16
Motherboard resources
0020
0021
2
Programmable interrupt controller
0022
003F
30
Motherboard resources
0040
0043
4
System timer
0044
005F
28
Motherboard resources
0060
0060
1
Keyboard controller
0061
0061
1
System loudspeaker
0062
0063
2
Motherboard resources
0064
0064
1
Keyboard controller
0067
006F
9
Motherboard resources
0070
0075
6
System CMOS/real-time clock
0076
0080
138
Motherboard resources
0081
008F
15
DMA controller
0090
009F
16
Motherboard resources
00A0
00A1
2
Programmable interrupt controller
00A2
00BF
30
Motherboard resources
00C0
00DF
32
DMA controller
00E0
00EF
16
Motherboard resources
00F0
00FE
15
Numeric data processor
0100
016F
112
Unused
0170
0177
8
Secondary EIDE channel
0178
01EF
120
Unused
01F0
01F7
8
Primary EIDE channel
Switchable in Setup, then
free
01F8
01FF
116
Unused
0200
0273
16
Reserved for game port
0274
0277
4
ISA PNP Read Data Port
0279
0279
4
ISA PNP Read Data Port
027C
02E7
108
Unused